chebfun-users

A FEW YEARS AGO, THEY KILLED A THIRTEEN-YEAR-OLD BOY! THESE STUPID CRIMINALS! AND ITALIAN! WORK FOR

Dear Calin, We have just updated the way we compute the residues; this *might* resolve your issue,

Dear All, I try: N = chebop(@(x,u) (2*x*diff(u,2)+diff(u))*(u+1)+20*x*(u+1),[0, 1]) N.lbc=@(x,u)(x^(1

Dear Calin Please provide a minimal reproducable example so that we might be able to help. Best

Hi Azfal Chebfun does support discontinuous ODEs. Here is a toy example: t0 = 0; N = chebop(@(t,u)

I am trying to approximate some numerically derived functions using minimax polynomials, but would

One option might be https://github.com/cstroessner/EFTT. This is not part of Chebfun though. On

Dr. Trefethen, Thank you for the reply. I appreciate it. I will look into this closely and report

Dear All I would like to know if there is a way to compute all local minima of a Chebfun3 object over

Thank you! On Thursday, May 9, 2024 at 5:07:04 AM UTC-4 Nick Hale wrote: Hi all Yes, that about

Dear all, I try the following: pdefun = @(u) -3*(u.^2).*diff(u)-ep*diff((u^3)*diff(u,3)) and I get

Topic line says it all.: are there 2- (at least) and 3-D versions of polyfit? I assume not since I

Hi Robert, Long-time casual chebfun user here. You could always use the interp1 function (and you

Dear Calin Please provide a minimal working of your code that is not working. However, if you are

Dear Calin I suspect the issue is that \ is outputting first the two solutions to your ODE system (

Using the equation in the image and the Dirichlet Boundary Conditions: Specify the value of the

Very happy new year to all chebfun-users. Thanks a lot Nick for your help. Your code segment seems

I could not find an example where periodic BC are set together with a zero mean or other constraints.

How to fix the error "Unable to execute command left4dead2 exe steam2 11"If you are a fan

Hi Aman Thakur Installation instructions can be found here: https://www.chebfun.org/download/ The

So far as I know Chebfun doesn't work with Octave. I'm not aware that we've investigated

Suppose [q_1(x), q_2(x),...,q_n(x)] constitutes a quasimatrix, and consider the QR factorization of

Hi, Just wondering if there have been any updates to this? I just recently tried the same and got the

I have the following system of differetial equations, which are linearized based on steady state

Dear Quentien and Dongwoo (for a reply after a 4-year wait!) For polynomial approximation in

Thank you for the response Nick! On Thursday, July 20, 2023 at 6:47:21 AM UTC-4 nick....@gmail.com

Thank you everyone! Very helpful! I indeed obtained a very accurate eigen-systems. By the way, the

Hi Jack Section 6 of this paper might help. https://appliedmaths.sun.ac.za/~nhale/publications/

Thanks a lot. That looks very promising. Best wishes, Jonathan On Tuesday, April 25, 2023 at 10:15:46

Dear Ian, Thank you for your help. Best, Shiba On Thursday, April 13, 2023 at 12:52:55 PM UTC-7 iajze